Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a085c2e39832021…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 18:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0818b783a41889650b6e7986d5e873b7 SHA-1: 6c64de74bd7cc43fda78689b195875d828356ab3 SHA-256: 7a085c2e39832021ea3781c54a6e7fafb7e6e2b0ca9e3794cb4edc2c64f91cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=how+to+screenshot+samsung+note+3 PDF link annotation
    • http://mikol-styl.cz/userfiles/file/43213486509.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/81e00f0310c5c5e024b9a5eb7c2a88eb/morekilererovo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/03944e26ec67e2ef92ced950293b6004/fosujozagetikadineva.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/52362742026.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/fifiwiw.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/98766287760.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e60deac995d8146dc3bc6f6c42e8b060/vuzeja.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/porag.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9feadd302---narejezudise.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905054832_577825575.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7u03umo77ub5md60n2091khlk6/20962617336.pdfIn PDF document text
    • http://zerosquareonline.com/file/70545773443.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jezurobajajivofubiji.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81781786100.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tazija.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/28119953268.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vubuvuketarixufigef.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/65420114844.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/7863859678.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/42777451951.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zetezaditudatagodexajofa.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/15846960027.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sazon.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/zexevetononoxitu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 17900 bytes
SHA-256: db0dfc85bc3212d129a1cfae5b059b5402f3a0d2ba27ca7e0c01a7d4178fc527
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 10888 bytes
SHA-256: 68b0343f2b1c5e49e92c79f46bef0003ab7ad8e31bc2f3889134ce0c337ad517

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